Improvement in pulley and wheel chucks for metal-turning lathes



J.' '.D. ALVORD.

`PULLQssLAND WHEEL cHUcKs YFort METAL T1:mum-LATEEs.A Y

N.1s4,esa. Patented mmm; .1876.'

WITNESSES INVENTOR '.f H/vivi.

UNITED STATES .PATENT QEETCE.

JosEPE D. ALvoRD, 0E BRIDCEPOET, CONNECTICUT.

a IMPROVEMENT yIN PULLEY AND WHE-ELICHUCKS FOR METAL-TURNING LATHES.

Specitcation forming part of 'Letters Patent No. 184.688. dated November28,1876; application filed oetoberev, w16.

To all whom it may concern Be it known that I, JOSEPH D. ALVORD, oBridgeport, in the county oi' Fairiield and State ot' Connecticut, haveinvented certain new and useful Improvements in Machines i'or TurningMetal Wheels and Pulleys, of which the following is a specification Myinvention relates to a machine of that class employed in formingperipheral grooves in wheels, pulleys, Snc., as well as to one adapt edfor use in connection with suitable cutters for both turning the facesor sides and peripheries of the wheels, 85e.; and my improvements areespecially applicable to a machine such as shown and described inLetters Patent ot' the United States, N o. 180,409, granted me August 1,1876, for machines for grooving metal pulleys.

My object is to provide simple means foradjusting and securing the wheelor pulley to be turned upon the spindle by which it is revolved, in suchmanner that when turned its side or face and its periphery shall betruly finished relatively to each other, and the peripheral groove orgrooves, When formed therein, be exactly concentric with the axisthereof. The subject-matter claimed consists of certain novelconstructions and combinatiousot' parts, hereinafter specificallydesignated.

AIn the accompanying drawings, Figure l represents a longitudinalelevation ot'sovmuch oi' a machine as is necessary' to illustrate myinvention; Fig. 2, a section through the spindie or shaft ot' themachine on the line 2 2 of Fig. 1, showing the rear ofthe chuck orcentering-head on an enlarged scale; and Fig. 3, a section on the lille1 1 oi' Fig. 2, showing a wheel adjusted in position upon the spindle.

A shait or spindle, A, supported and mounted as in my machine patentedAugust l, 1876, hereinbefore referred to, or in other suitableWell-known Ways, is provided with a chuck or holder, B, in advance ot'which its end projects. The chuck-head or centering-disk. is providedwith three or more openings, through which project stud bearings or pinsC C C. These pins Work endwise in their bearings in the chuck-head,which is of sufticient thick- 'ness to prevent any wabbling or sidewisemovement ofthe pins. Yielding pressure upon the heads b ofthe pins givesthem a tendtion by adjustable clamps or set-screws E E E passing throughthe periphery ot' the chuckhead, or in other well-known ways.

When a Wheel, F, is to be turned it is rst drilled at the center andreamed out to form a bearing of a diameter adapted to it snugly upon theouter end ot' the spindle A. Itis then slipped upon the spindle andpushed back until its rear face, or that side adjacent to thechuck-head, comes in contact with the ends oi' all the yielding bearingsC projecting through and in advance Aof the chuck. rlhe pins yield toaccommodatethemselves to any inequalities in the surface of the wheel.The set-screws E, which had been previously looscned to allow theprojecting bearings or pins to move endwise to adjust themselves againstthe wheel, are then tightened to tix the pins and afford a rigid bearingfor the back of the Wheel. A set-screw, G, passing through lthefheelhub, (or any other suitable retaining device,) is then adjusted tohold the wheel against movement en dwise ot' the spindle -and keep it upto the pins. The wheel is now ready to be revolved, and the turning ot'the periphery and face of the wheel is next proceeded with. Any suitablecutting devices may be employed for turning oi' the wheel face andperiphery; but I prefer to form the groove or grooves in its peripheryby the cutters and mechanism described in my before-mentioned patent ofAugust 1, 1876. The spindle is revolved in any suitable Well-known Way.

From the foregoing description it Will be seen that whether the back or'a-wheel or pulley to be turned is true or irregular when'it is adjustedagainst the yielding self-adjusting pins, the wheel, when finished,.willhave its groove or grooves truly formed relatively to the wheel Vaxisand face, and that it is immaterial whether the bearing of the Wheel inthe rough be made exactly in the center or eccentric to the periphery orhub, as the groove,

3. The combination, substantially as here inhefore set forth, of thechuck-disk or centering-head, the bearing-pins, adapted to be ixed inposition in the head, and the spindle projecting in ad` vence of saidhead, and adapted to receive the wheel to be turned, and admit of itsbeing secured thereon against the bearing-pins.

In testimony vwhereof `I have hereunto subscribed my name.

JOSEPH D. ALVORD.

Witnesses:

F. HURD,

. A. W. HURD.

self-adjusting, endwise-moving y

